Geometry Problem 992: Triangle, Interior Point, Angles, 20, 30 , 40, 50 Degree. Level: School, College

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The figure shows a triangle ABC. D is an interior point so that the measure of angles CAD, ABD, CBD, and BAD are 20, 30, 40, and 50 degree, respectively. Find the measure of angle BDC.

Geometry Problem 992: Triangle, Interior Point, Angles, 20, 30 , 40, 50 Degree